阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    My husband and I were paying a visit ____ my parents in Tucson. We went to a fast-food restaurant for dinner together. My husband went to the counter ____ (order) dishes and I stood with my parents.

    My dad is 90 years old. He can hardly see very well and walks with a stick. I was scanning the restaurant, ____ (wait) to sit at the first table that was ____ (convenient) than others. A woman who was sitting with her son made eye contact with me and asked me to come to her. With a ____(puzzle) look on my face, I pointed to myself and said , “Me ?” She ____ (nod) and said, “Yes, you.” I walked to the table and she said, “Bring your family here. I can finish eating at the counter. My son is in ____ hurry to leave anyway.” My eyes ____ (fill) with tears as she wiped down the table and guided my dad to the seat.

    I always believe that there are ____ (nature) kind people in this world. This woman has set a good example to her son, ____ is a really lucky guy.